Communications protocol

Figure 2. The TCP/IP model or Internet layering scheme and its relation to some common protocols.

Figure 3. Message flows using a protocol suite. Black loops show the actual messaging loops, red loops are the effective communications between layers enabled by the lower layers.

Figure 4. Message flows in the presence of a router

Figure 5: Protocol and software layering

In telecommunications, a communications protocol is a system of rules that allow two or more entities of a communications system to transmit information via any kind of variation of a physical quantity. These are the rules or standard that defines the syntax, semantics and synchronization of communication and possible error recovery methods. Protocols may be implemented by hardware, software, or a combination of both.

单词	Network protocol
释义	Network protocol 英语百科 Communications protocol In telecommunications, a communications protocol is a system of rules that allow two or more entities of a communications system to transmit information via any kind of variation of a physical quantity. These are the rules or standard that defines the syntax, semantics and synchronization of communication and possible error recovery methods. Protocols may be implemented by hardware, software, or a combination of both.
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Network protocol

Communications protocol